4. Previously diagnosed with multiple myeloma based on standard criteria and requires therapy for primary refractory disease or 1st - 3rd relapse because of progressive disease (PD), defined as a 25% increase in M-protein, development of new or worsening of existing lytic bone lesions or soft tissue plasmacytoma, or hypercalcemia (serum calcium > 11.3 mg/dL), or clinical relapse from CR.